Today, I’ve been writing few methods for my DAL classes, of course, I decided to have one or few integration unit tests that hits database and see actual SQLs with NHibernate Profiler.

So in couple of minetes I’ve got unit tests that had following line in the beggining of each:

 HibernatingRhinos.Profiler.Appender.NHibernate.NHibernateProfiler.Initialize();

if you don’t know, this line attaches your execution code with NHibernate Profiler, so I’m able to see SQLs NHibernate generates.

When I run bunch of unit tests in my testing file, I’ve got strange picture with duplicating of queries for each test with arithmetic progression. And N+1 problem, but hold on, I’m sure that I did everything through joins.

Reason is that profiler appends to my code on each new test run and that is why it start thinking that I have multiple selects to get list of something.

Solution, which I would recommend as pattern for writing Unit Tests with NHibernate Profiler is following:

        [SetUp]
        public void SetUp()
        {
            HibernatingRhinos.Profiler.Appender.NHibernate.NHibernateProfiler.Initialize();
        }
        [TearDown]
        public void TearDown()
        {
            HibernatingRhinos.Profiler.Appender.NHibernate.NHibernateProfiler.Stop();
        }
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